Shutter driving device and three-dimensional video display system

Abstract

Disclosed herein is a shutter driving device that drives a first shutter including a first driving-subject capacitive load and a second shutter including a second driving-subject capacitive load. The shutter driving device includes a power recovery unit, a first driving path, a second driving path, a third driving path, a first clamp circuit, a second clamp circuit, a third clamp circuit, a power recovery path, and a recovery control switch configured to be disposed on the power recovery path.

1 . A shutter driving device that drives a first shutter including a first driving-subject capacitive load and a second shutter including a second driving-subject capacitive load, the shutter driving device comprising:
 a power recovery unit configured to have at one power recovery capacitor including a function to output an intermediate voltage between a supply potential and a reference potential and a power recovery function for recovering power;   a first driving path;   a second driving path;   a third driving path;   a first clamp circuit configured to be capable of clamping one end side of the first driving-subject capacitive load to the supply potential or the reference potential via the first driving path;   a second clamp circuit configured to be capable of clamping one end side of the second driving-subject capacitive load to the supply potential or the reference potential via the second driving path;   a third clamp circuit configured to be capable of clamping the other end side of the first driving-subject capacitive load and the other end side of the second driving-subject capacitive load to the supply potential or the reference potential via the third driving path;   a power recovery path configured to connect the power recovery capacitor to any of the one end side of the first driving-subject capacitive load, the one end side of the second driving-subject capacitive load, the other end side of the first driving-subject capacitive load, and the other end side of the second driving-subject capacitive load; and   a recovery control switch configured to be disposed on the power recovery path.   
     
     
         2 . The shutter driving device according to  claim 1 , further comprising:
 a controller configured to control the recovery control switch,   wherein the controller sets the recovery control switch to a conductive state when the intermediate voltage is output from the power recovery capacitor to the one end side or the other end side of the driving-subject capacitive load connected to the power recovery path or when power of the one end side or the other end side of the driving-subject capacitive load connected to the power recovery path is recovered to the power recovery capacitor.   
     
     
         3 . The shutter driving device according to  claim 2 , wherein
 the controller has a function to set, to a high-impedance state, output of the clamp circuit connected to the one end side or the other end side of the driving-subject capacitive load connected to the power recovery path on which the recovery control switch is disposed when setting the recovery control switch to a conductive state.   
     
     
         4 . The shutter driving device according to  claim 2 , further comprising:
 a driving control switch configured to be disposed on the driving path connected to the one end side or the other end side of the driving-subject capacitive load connected to the power recovery path on which the recovery control switch is disposed,   wherein the controller sets the driving control switch to a non-conductive state when setting the recovery control switch to a conductive state.   
     
     
         5 . The shutter driving device according to  claim 3 , wherein
 each of the clamp circuits includes a power-supply-side connection switch that connects the driving path connected to the clamp circuit to the supply potential, and a reference-side connection switch that connects the driving path connected to the clamp circuit to the reference potential,   the controller sets the power-supply-side connection switch and the reference-side connection switch to a conductive state and a non-conductive state in a complementary manner in clamp operation, and   the controller sets the power-supply-side connection switch and the reference-side connection switch to a non-conductive state when setting the recovery control switch to a conductive state.   
     
     
         6 . The shutter driving device according to  claim 1 , wherein
 the third driving path includes a fourth driving path,   the third clamp circuit includes a fourth clamp circuit,   the third clamp circuit is capable of clamping the other end side of the first driving-subject capacitive load to the supply potential or the reference potential via the third driving path, and   the fourth clamp circuit is capable of clamping the other end side of the second driving-subject capacitive load to the supply potential or the reference potential via the fourth driving path.   
     
     
         7 . The shutter driving device according to  claim 1 , wherein
 one third driving path and one third clamp circuit are disposed, and   the other end side of the first driving-subject capacitive load and the other end side of the second driving-subject capacitive load are capable of being clamped to the supply potential or the reference potential via the third driving path.   
     
     
         8 . A three-dimensional video display system comprising:
 video display apparatus configured to include a display device; and   three-dimensional glasses configured to include a shutter driving device that drives a first shutter including a first driving-subject capacitive load and a second shutter including a second driving-subject capacitive load, and obtain three-dimensional stereoscopic view video through viewing of the display device, wherein   the video display apparatus includes a communication unit capable of transmitting a synchronizing signal of video to the three-dimensional glasses,   the three-dimensional glasses include
 a communication unit capable of receiving a synchronizing signal transmitted from the communication unit of the video display apparatus, and 
 a controller that carries out driving control of the shutter driving device at a timing synchronized with the received synchronizing signal, and 
 the shutter driving device having 
 a power recovery unit having one power recovery capacitor including a function to output an intermediate voltage between a supply potential and a reference potential and a power recovery function for recovering power, 
 a first driving path, 
 a second driving path, 
 a third driving path, 
 a first clamp circuit capable of clamping one end side of the first driving-subject capacitive load to the supply potential or the reference potential via the first driving path, 
 a second clamp circuit capable of clamping one end side of the second driving-subject capacitive load to the supply potential or the reference potential via the second driving path, 
 a third clamp circuit capable of clamping the other end side of the first driving-subject capacitive load and the other end side of the second driving-subject capacitive load to the supply potential or the reference potential via the third driving path, 
 a power recovery path that connects the power recovery capacitor to any of the one end side of the first driving-subject capacitive load, the one end side of the second driving-subject capacitive load, the other end side of the first driving-subject capacitive load, and the other end side of the second driving-subject capacitive load, and 
 a recovery control switch disposed on the power recovery path. 
   
     
     
         9 . The three-dimensional video display system according to  claim 8 , wherein
 the shutter driving device has the controller that controls the recovery control switch, and   the controller sets the recovery control switch to a conductive state when the intermediate voltage is output from the power recovery capacitor to the one end side or the other end side of the driving-subject capacitive load connected to the power recovery path or when power of the one end side or the other end side of the driving-subject capacitive load connected to the power recovery path is recovered to the power recovery capacitor.   
     
     
         10 . The three-dimensional video display system according to  claim 9 , wherein
 the controller has a function to set, to a high-impedance state, output of the clamp circuit connected to the one end side or the other end side of the driving-subject capacitive load connected to the power recovery path on which the recovery control switch is disposed when setting the recovery control switch to a conductive state.   
     
     
         11 . The three-dimensional video display system according to  claim 9 , wherein
 the shutter driving device has a driving control switch disposed on the driving path connected to the one end side or the other end side of the driving-subject capacitive load connected to the power recovery path on which the recovery control switch is disposed, and   the controller sets the driving control switch to a non-conductive state when setting the recovery control switch to a conductive state.   
     
     
         12 . The three-dimensional video display system according to  claim 10 , wherein
 each of the clamp circuits includes a power-supply-side connection switch that connects the driving path connected to the clamp circuit to the supply potential, and a reference-side connection switch that connects the driving path connected to the clamp circuit to the reference potential,   the controller sets the power-supply-side connection switch and the reference-side connection switch to a conductive state and a non-conductive state in a complementary manner in clamp operation, and   the controller sets the power-supply-side connection switch and the reference-side connection switch to a non-conductive state when setting the recovery control switch to a conductive state.   
     
     
         13 . The three-dimensional video display system according to  claim 8 , wherein
 the third driving path includes a fourth driving path,   the third clamp circuit includes a fourth clamp circuit,   the third clamp circuit is capable of clamping the other end side of the first driving-subject capacitive load to the supply potential or the reference potential via the third driving path, and   the fourth clamp circuit is capable of clamping the other end side of the second driving-subject capacitive load to the supply potential or the reference potential via the fourth driving path.   
     
     
         14 . The three-dimensional video display system according to  claim 8 , wherein
 one third driving path and one third clamp circuit are disposed, and   the other end side of the first driving-subject capacitive load and the other end side of the second driving-subject capacitive load are capable of being clamped to the supply potential or the reference potential via the third driving path.